Although I lived in Darjeeling as a child and have been back there several times, I have never actually visited Bhutan. I would love to go there and found this site useful http://www.nationalgeographicexpeditions.com/493.html for ideas of what to do there. I like tramping, and the Himalayas are a great place to trek - although there is a lot of up and down!
It seems as though the Bhutanese government are genuinely interested in protecting the environment and their local culture, so it would be good to learn about how they plan for this.
I liked this photo of Punakha Dzong http://images.travelpod.com/users/gypsymichelle/nepal-2006.1160073480.punakha_dzong_003.jpg and I am interested in seeing how crafts such as this weaving are made. http://images.jupiterimages.com/common/detail/56/11/22571156.jpg I love going to craft markets anywhere in the world.
I have friends who live in Bangkok so going through Thailand would be good as I could catch up with at the same time.